题目内容

Don't leave the classroom_____ you finish your exercises.

A. before
B. since
C. after
D. when

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Please buy a dozen of egges_____ you go to the grocery store.

A. before
B. since
C. after
D. when

Mary greets_____ at the gate of her store every morning.

A. costume
B. custom
C. customer
D. customers

The online store offers free delivery_____ the goods you buy are over 100 yuan.

A. wether
B. if
C. when
D. while

If you buy three kilos of strawberries now, you will get a_____.

A. disregard
B. discontent
C. discount
D. encounter